JP2003110497A - Group communication system - Google Patents

Group communication system

Info

Publication number
JP2003110497A
JP2003110497A JP2001298960A JP2001298960A JP2003110497A JP 2003110497 A JP2003110497 A JP 2003110497A JP 2001298960 A JP2001298960 A JP 2001298960A JP 2001298960 A JP2001298960 A JP 2001298960A JP 2003110497 A JP2003110497 A JP 2003110497A
Authority
JP
Japan
Prior art keywords
wireless
group communication
base station
radio
station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001298960A
Other languages
Japanese (ja)
Inventor
Kazuya Abe
和也 阿部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kokusai Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2001298960A priority Critical patent/JP2003110497A/en
Publication of JP2003110497A publication Critical patent/JP2003110497A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To materialize the effective use of a radio channel by enabling the user to designate group communication and designate a radio base station from a radio mobile station, thereby enabling the user to perform communication, and limiting it to a necessary area in performing group communication from the target radio mobile station, in a radio communication system. SOLUTION: In performing the group communication from the radio mobile station, the designation of group communication for an objective group and, so that the user can communicate a message, limiting it to a necessary area, the designation of a radio base station are enabled, and also the necessity of preparing a radio channel for group communication in an undesignated radio base station is obviated, by adding a new function of performing the designation of a base station in addition to performing the designation of group communication in a radio mobile station in question.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は無線通信システムに
係り、更に詳しくは複数の無線基地局ゾーンを用いたグ
ループ通信に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly to group communication using a plurality of wireless base station zones.

【0002】[0002]

【従来の技術】従来のグループ通信方式の一例は、特開
昭63−281529号広報に記載されている。特開昭
63−281529号広報によると、無線移動局からグ
ループ通信を行う場合、まず前記無線移動局がグループ
通信指定を設定する。この設定により、前記無線移動局
の位置が登録されている無線基地局へグループ通信要求
が前記無線移動局から送信される。そして、グループ通
信要求が前記無線基地局(グループ通信指定の設定を行
った移動局を位置登録している基地局)から回線制御装
置(統制局)へ送信されることにより、回線制御装置
(統制局)が起動する。回線制御装置(統制局)は全て
の無線基地局を管理していることにより、通信ルートが
形成され、無線基地局は各々グループ通信用の無線チャ
ネルを使用してグループ通信を実施する。
2. Description of the Related Art An example of a conventional group communication system is described in JP-A-63-281529. According to Japanese Patent Laid-Open No. 63-281529, when performing group communication from a wireless mobile station, the wireless mobile station first sets a group communication designation. With this setting, a group communication request is transmitted from the wireless mobile station to the wireless base station in which the position of the wireless mobile station is registered. Then, the group communication request is transmitted from the wireless base station (the base station that has registered the location of the mobile station for which the group communication designation has been set) to the line control device (control station), so that the line control device (control Station) starts. The line control device (control station) manages all the wireless base stations to form a communication route, and the wireless base stations each carry out group communication using the wireless channel for group communication.

【0003】[0003]

【発明が解決しようとする課題】前述の従来技術では、
無線移動局からグループ通信を行う場合、前記無線移動
局で設定したグループ通信指定は可能であるけれども、
無線基地局指定つまり地域指定が不可能であるという欠
点がある。この欠点により、例えば無線通信システムを
防災に用いた場合、災害のあった特定地域内でのグルー
プ通信を行うことができないという問題が発生する。
In the above-mentioned prior art,
When performing group communication from a wireless mobile station, it is possible to specify group communication set in the wireless mobile station,
There is a drawback that it is not possible to specify the wireless base station, that is, the area. Due to this drawback, for example, when a wireless communication system is used for disaster prevention, there arises a problem that group communication cannot be performed in a specific area where a disaster has occurred.

【0004】そこで本発明では、この問題を解決し、無
線移動局からグループ通信指定と無線基地局指定とを行
えるようにすることにより、必要な地域に限定して通信
を行うことができるようにすることを目的とする。この
目的を達成することにより、無線チャネルの有効利用を
図ることができる。
Therefore, in the present invention, by solving this problem and enabling the group communication designation and the radio base station designation from the radio mobile station, the communication can be limited to the necessary area. The purpose is to do. By achieving this object, it is possible to effectively use the wireless channel.

【0005】[0005]

【課題を解決するための手段】本発明は、上記目的を達
成するため、無線移動局からグループ通信を行う場合に
は、グループ通信指定と無線基地局指定とを行うように
したものである。
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is designed to specify a group communication and a wireless base station when group communication is performed from a wireless mobile station.

【0006】[0006]

【発明の実施の形態】以下、本発明の一実施例であるグ
ループ通信方式について図1〜5を参照して説明する。
図1は無線通信システムの構成を示すブロック図であ
る。図1において、1〜8は無線移動局、10、11は
無線基地局、12は回線制御装置(統制局)、14は無
線基地局10の無線ゾーン、15は無線基地局11の無
線ゾーンである。
BEST MODE FOR CARRYING OUT THE INVENTION A group communication system according to an embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram showing the configuration of a wireless communication system. In FIG. 1, 1 to 8 are wireless mobile stations, 10 and 11 are wireless base stations, 12 is a line control device (control station), 14 is a wireless zone of the wireless base station 10, and 15 is a wireless zone of the wireless base station 11. is there.

【0007】無線移動局1〜8は、扱者が移動しながら
作業を行うときに携帯するか、または自動車に搭載して
互いに連絡をとるために使用される。更に、無線移動局
1〜8は同一グループに属しているため、同一のグルー
プ識別符号G1を有している。そして、各々の無線移動
局は、個々の識別符号を有している。例えば無線移動局
1は、識別符号S1を有している。
[0007] The wireless mobile stations 1 to 8 are used when an operator carries out work while moving, or is mounted in an automobile and used for communicating with each other. Further, since the wireless mobile stations 1 to 8 belong to the same group, they have the same group identification code G1. Then, each wireless mobile station has an individual identification code. For example, the wireless mobile station 1 has an identification code S1.

【0008】無線基地局10、11は有線回線で回線制
御装置(統制局)12に接続されると共に、無線移動局
と無線回線で接続される。そして、建物の屋上や山頂に
分散配置される。無線基地局10、11と無線移動局1
〜8との通信方式は、例えば、TDMA(Time D
ivision Multiple Access)方
式などのデジタル通信方式を用いている。無線基地局1
0には無線ゾーン14内の無線移動局1〜5が接続可能
である。一方、無線基地局11には無線ゾーン15内の
無線移動局6〜8が接続可能である。
The wireless base stations 10 and 11 are connected to a line control device (control station) 12 by a wired line and are also connected to a wireless mobile station by a wireless line. And it is distributed and arranged on the roof of the building and the mountaintop. Radio base stations 10 and 11 and radio mobile station 1
The communication system with 8 is, for example, TDMA (Time D
A digital communication method such as an "vision multiple access" method is used. Wireless base station 1
The wireless mobile stations 1 to 5 in the wireless zone 14 can be connected to 0. On the other hand, the wireless mobile stations 6 to 8 in the wireless zone 15 can be connected to the wireless base station 11.

【0009】回線制御装置(統制局)12には、複数の
無線基地局が有線回線で接続され、それら無線基地局と
構内交換機や公衆回線の電話回線または専用の遠隔制御
装置との回線を切り替えて接続するものである。また、
無線移動局は接続可能な無線基地局を常時管理してい
る。
A plurality of wireless base stations are connected to the line control device (control station) 12 by wire lines, and the lines between these wireless base stations and a private branch exchange, a public line telephone line, or a dedicated remote control device are switched. To connect. Also,
The wireless mobile station constantly manages connectable wireless base stations.

【0010】図2は、図1に示す無線移動局の構成の一
例を示すブロック図である。図2において、201はア
ンテナで無線回線の高周波を送信または受信する。20
2は無線制御部で変調部203からの送信データを搬送
波に重畳させて送信すると共に、アンテナ201で受信
した高周波信号から所定の周波数帯の信号を抽出し、復
調部204へ出力する。また、通信制御部205からの
制御により、チャネルの切り替えや、送信モードと受信
モードとの切り替えを行う。203は変調部で通信制御
部205から出力される送信データを所定の変調方式
(例えば、直交位相変調)で変調し、無線制御部202
へ出力する。204は復調部で無線制御部202から出
力された受信データを所定の復調方式で復調し、通信制
御部205へ出力する。205は通信制御部でCPU、
ROM、RAMを含み、ROMに格納されているプログ
ラムに従って無線移動局の通信状態を制御する。206
は入力部でキー操作装置、マイクロホンを含み、データ
や音声を通信制御部205に入力する。207は出力部
で、記憶装置、表示装置、スピーカを含み、通信制御部
205から出力されるデータを記憶、表示、音声出力す
る。208は電源部で、各部(無線制御部202〜出力
部207)に安定化された必要な電源を供給する。
FIG. 2 is a block diagram showing an example of the configuration of the wireless mobile station shown in FIG. In FIG. 2, 201 is an antenna which transmits or receives the high frequency of the wireless line. 20
Reference numeral 2 denotes a wireless control unit that superimposes transmission data from the modulation unit 203 on a carrier wave and transmits the same, and also extracts a signal in a predetermined frequency band from the high frequency signal received by the antenna 201 and outputs the signal to the demodulation unit 204. Further, under the control of the communication control unit 205, the channel is switched and the transmission mode and the reception mode are switched. A modulation unit 203 modulates the transmission data output from the communication control unit 205 by a predetermined modulation method (for example, quadrature phase modulation), and the radio control unit 202.
Output to. A demodulation unit 204 demodulates the reception data output from the radio control unit 202 by a predetermined demodulation method and outputs the demodulated data to the communication control unit 205. A communication control unit 205 is a CPU,
It includes a ROM and a RAM, and controls the communication state of the wireless mobile station according to a program stored in the ROM. 206
Is an input unit including a key operation device and a microphone, and inputs data and voice to the communication control unit 205. An output unit 207 includes a storage device, a display device, and a speaker, and stores, displays, and outputs voice data output from the communication control unit 205. Reference numeral 208 denotes a power supply unit that supplies stabilized necessary power to each unit (the wireless control unit 202 to the output unit 207).

【0011】図3は、図1に示す無線基地局の構成の一
例を示すブロック図である。301は送信アンテナで無
線回線の高周波を送信する。302は受信アンテナで無
線回線の高周波を受信する。303は送信部で、無線制
御部305からの送信データを搬送波に重畳させて送信
する。304は受信部で、アンテナ302から受信した
高周波信号から所定の周波数帯の信号を抽出し、無線制
御部305へ出力する。305は無線制御部で通信制御
部307から出力される送信データを所定の変調方式
(例えば、直交位相変調)で変調し、送信部303へ出
力する。また、受信部304から出力された受信データ
を所定の復調方式で復調し通信制御部307へ出力す
る。306は外部装置接続部で後述する回線制御装置
(統制局)と接続するためのインタフェースを有する。
307は通信制御部でCPU、ROM、RAMを含みR
OMに格納されているプログラムに従って無線基地局の
通信状態を制御する。308は電源部で、各部(送信部
303〜通信制御部307)に安定化された必要な電源
を供給する。
FIG. 3 is a block diagram showing an example of the configuration of the radio base station shown in FIG. Reference numeral 301 denotes a transmitting antenna that transmits a high frequency of the wireless line. A receiving antenna 302 receives a high frequency of the wireless line. A transmitting unit 303 superimposes the transmission data from the wireless control unit 305 on a carrier wave and transmits it. A receiving unit 304 extracts a signal in a predetermined frequency band from the high frequency signal received from the antenna 302 and outputs the signal to the wireless control unit 305. A wireless control unit 305 modulates transmission data output from the communication control unit 307 by a predetermined modulation method (for example, quadrature phase modulation), and outputs the transmission data to the transmission unit 303. Also, the reception data output from the reception unit 304 is demodulated by a predetermined demodulation method and output to the communication control unit 307. An external device connection unit 306 has an interface for connecting to a line control device (control station) described later.
A communication control unit 307 includes a CPU, a ROM, a RAM, and an R
The communication state of the wireless base station is controlled according to the program stored in the OM. Reference numeral 308 denotes a power supply unit that supplies stabilized necessary power to each unit (transmission unit 303 to communication control unit 307).

【0012】図4は、図1に示す回線制御装置(統制
局)の構成を示すブロック図である。401は外部装置
接続部で前述の無線基地局と接続するためのインタフェ
ースを有する。402は回線制御部でCPU、ROM、
RAMを含みROMに格納されているプログラムに従っ
て回線接続制御を行っている。また、無線移動局と接続
可能な無線基地局との対応を管理するための記憶装置を
有しており、この記憶装置により、無線移動局の接続制
御を行っている。403は電源部で、各部(外部装置接
続部401、回線制御部402)に安定化された必要な
電源を供給する。
FIG. 4 is a block diagram showing the configuration of the line control device (control station) shown in FIG. An external device connection unit 401 has an interface for connecting to the above-described wireless base station. A line controller 402 includes a CPU, a ROM,
The line connection control is performed according to the program stored in the ROM including the RAM. Further, it has a storage device for managing the correspondence between the wireless mobile station and a connectable wireless base station, and this storage device controls the connection of the wireless mobile station. Reference numeral 403 denotes a power supply unit that supplies stabilized necessary power to each unit (external device connection unit 401, line control unit 402).

【0013】以下、図5を用いて本実施例のグループ通
信方式での動作について説明する。図5は、本実施例の
グループ通信方式での動作を示すシーケンス図である。
無線移動局1からグループ通信を開始するとき、グルー
プ識別符号と無線基地局を指定するための符号(以下、
無線基地局符号と称する。)とを入力部206を操作す
ることにより入力する。(本実施例でのグループ識別符
号、無線基地局符号はそれぞれG1、BS1である。)
この操作により、グループ識別符号G1と無線基地局符
号BS1とを含むグループ通信要求信号が無線移動局1
から送信される。そして、このグループ通信要求信号は
無線移動局1を位置登録している無線基地局10で受信
される。グループ通信要求信号を受信すると、無線基地
局10は外部装置接続部306により回線制御装置(統
制局)12へ伝送する。回線制御装置(統制局)12は
グループ通信要求信号を受信すると、同一グループに属
する無線移動局を記憶装置(回線制御部402に内蔵)
から読み出す。即ち、グループ識別符号G1を有する無
線移動局を記憶装置より読み出す。そして、読み出した
無線移動局を位置登録している無線基地局を抽出する。
更に、抽出した無線基地局の内、グループ通信要求信号
に重畳されている無線基地局符号と一致する基地局を選
択して回線接続し、グループ通信応答信号を出力する。
即ち、無線基地局符号BS1を有する無線基地局と回線
接続して、グループ通信応答信号を出力する。無線基地
局10は、自局の無線基地局符号がBS1であることに
よりグループ通信要求信号に重畳されている無線基地局
符号と一致しているため、回線制御装置(統制局)12
と回線接続して、グループ通信応答信号を出力する。そ
の結果、無線基地局10は、無線ゾーン14内でグルー
プ識別符号G1を有する無線移動局、即ち無線移動局1
〜5とグループ通信を開始する。一方、無線基地局11
は、自局の無線基地局符号がBSiであることによりグ
ループ通信要求信号に重畳されている無線基地局符号と
一致しないため、回線制御装置(統制局)12と回線接
続しない。従って、無線ゾーン15内にはグループ識別
符号G1を有する無線移動局6〜8はグループ通信を行
うことができない。
The operation of the group communication system of this embodiment will be described below with reference to FIG. FIG. 5 is a sequence diagram showing an operation in the group communication system of this embodiment.
When group communication is started from the wireless mobile station 1, a group identification code and a code for designating a wireless base station (hereinafter,
It is called a radio base station code. ) And are input by operating the input unit 206. (The group identification code and the radio base station code in this embodiment are G1 and BS1, respectively.)
By this operation, the group communication request signal including the group identification code G1 and the radio base station code BS1 is transmitted to the radio mobile station 1
Sent from. Then, this group communication request signal is received by the wireless base station 10 which has registered the position of the wireless mobile station 1. Upon receiving the group communication request signal, the wireless base station 10 transmits the signal to the line control device (control station) 12 through the external device connection unit 306. Upon receiving the group communication request signal, the line control device (control station) 12 stores the wireless mobile stations belonging to the same group in the storage device (built in the line control unit 402).
Read from. That is, the wireless mobile station having the group identification code G1 is read from the storage device. Then, the wireless base station that has registered the position of the read wireless mobile station is extracted.
Further, among the extracted wireless base stations, a base station that matches the wireless base station code superimposed on the group communication request signal is selected, the line connection is made, and the group communication response signal is output.
That is, a line connection is made with the radio base station having the radio base station code BS1 and a group communication response signal is output. Since the radio base station code of its own station is BS1, the radio base station 10 matches the radio base station code superimposed on the group communication request signal, so that the line control device (control station) 12
It is connected to the line and outputs a group communication response signal. As a result, the radio base station 10 has the radio mobile station having the group identification code G1 in the radio zone 14, that is, the radio mobile station 1
Start group communication with ~ 5. On the other hand, the wireless base station 11
Since the wireless base station code of its own station is BSi and does not match the wireless base station code superposed on the group communication request signal, does not connect the line to the line control device (control station) 12. Therefore, the wireless mobile stations 6 to 8 having the group identification code G1 cannot perform group communication within the wireless zone 15.

【0014】以上のように、本実施例でのグループ通信
方式では、グループ通信要求信号にグループ識別符号だ
けでなく無線基地局符号(例えば、BS1)も重畳する
ことにより、特定地域(例えば、無線ゾーン14)に限
定してグループ通信を行うことができる。
As described above, in the group communication system of the present embodiment, not only the group identification code but also the radio base station code (eg BS1) is superimposed on the group communication request signal, so that the specific area (eg radio Group communication can be performed only in the zone 14).

【0015】本実施例では、無線移動局(車載型、携帯
型を含む)を操作してグループ通信を行う場合について
説明したが、これに限定されるものではない。無線通信
システムに接続される機器(例えば、遠隔制御装置や電
話器、パーソナルコンピュータ、無線固定局)であるの
ならば、機器を操作してグループ通信を行うことができ
る。
In the present embodiment, a case has been described in which a wireless mobile station (including an in-vehicle type and a portable type) is operated to perform group communication, but the present invention is not limited to this. If the device is a device connected to the wireless communication system (for example, a remote control device, a telephone, a personal computer, a wireless fixed station), the device can be operated to perform group communication.

【0016】[0016]

【発明の効果】本発明によれば、無線移動局がグループ
通信要求を行うときに無線基地局を指定することができ
るようになったことにより、特定地域に限定したグルー
プ通信を行うことができるようになると共に、無線チャ
ネルの有効利用を図ることができる。即ち、無線基地局
を指定してグループ通信を行ったとき、指定されていな
い無線基地局はグループ通信用の無線チャネルを用意す
る必要がなくなり、全ての無線チャネルをグループ通信
以外に用いることができる。一方、無線基地局を指定し
ないでグループ通信を行ったとき、各無線基地局はグル
ープ通信用の無線チャネルを用意しなければならなくな
る。
According to the present invention, when a wireless mobile station can specify a wireless base station when making a group communication request, group communication limited to a specific area can be performed. As a result, the wireless channel can be effectively used. That is, when group communication is performed by designating a wireless base station, a wireless base station that is not designated does not need to prepare a wireless channel for group communication, and all wireless channels can be used for other than group communication. . On the other hand, when group communication is performed without designating a wireless base station, each wireless base station must prepare a wireless channel for group communication.

【図面の簡単な説明】[Brief description of drawings]

【図1】無線通信システムの構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of a wireless communication system.

【図2】無線移動局の構成を示すブロック図。FIG. 2 is a block diagram showing the configuration of a wireless mobile station.

【図3】無線基地局の構成を示すブロック図。FIG. 3 is a block diagram showing the configuration of a wireless base station.

【図4】回線制御装置(統制局)の構成を示すブロック
図。
FIG. 4 is a block diagram showing a configuration of a line control device (control station).

【図5】本発明の一実施例であるグループ通信方式の動
作を示すシーケンス図。
FIG. 5 is a sequence diagram showing an operation of a group communication system which is an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1〜8:無線移動局 10、11:
無線基地局 12:回線制御装置(統制局) 14、15:
無線ゾーン 201、301、302:アンテナ 202、30
5:無線制御部 203:変調部 204:復調
部 205、307:通信制御部 206:入力
部 207:出力部 208、30
8、403:電源部 303:送信部 304:受信
部 306、401:外部装置接続部 402:回線
制御部
1-8: Wireless mobile station 10, 11:
Radio base station 12: Line control device (control station) 14, 15:
Wireless zones 201, 301, 302: Antennas 202, 30
5: Radio control section 203: Modulation section 204: Demodulation section 205, 307: Communication control section 206: Input section 207: Output section 208, 30
8, 403: Power supply unit 303: Transmission unit 304: Reception unit 306, 401: External device connection unit 402: Line control unit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】統制局と、該統制局と接続される複数の無
線基地局と、該無線基地局と無線回線を介して接続され
る複数の無線端末局とを含む無線通信システムのグルー
プ通信方式において、 複数ある前記無線端末局の内、1の無線端末局が該無線
端末局の位置を登録している無線基地局を介して前記統
制局へグループ通信要求信号を送信するとき、複数ある
前記無線基地局の内、1の無線基地局を指定する無線基
地局符号を重畳し、所定地域に限定してグループ通信を
行うようにしたことを特徴とするグループ通信方式。
1. A group communication of a wireless communication system including a control station, a plurality of radio base stations connected to the control station, and a plurality of radio terminal stations connected to the radio base station via radio lines. In the method, when one of the plurality of wireless terminal stations transmits a group communication request signal to the control station via a wireless base station that has registered the position of the wireless terminal station, there is a plurality of wireless communication terminals. A group communication system characterized in that a wireless base station code designating one wireless base station among the wireless base stations is superimposed and group communication is performed only in a predetermined area.
【請求項2】請求項1記載のグループ通信方式におい
て、 前記無線基地局は各々自局の無線基地局符号を有し、前
記グループ通信要求信号に重畳された無線基地局符号と
一致したとき、前記無線基地局の無線ゾーンに限定して
グループ通信を行うようにしたことを特徴とするグルー
プ通信方式。
2. The group communication system according to claim 1, wherein each of the wireless base stations has its own wireless base station code, and when the wireless base station code matches the wireless base station code superimposed on the group communication request signal, A group communication method, wherein group communication is performed only in a wireless zone of the wireless base station.
JP2001298960A 2001-09-28 2001-09-28 Group communication system Pending JP2003110497A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001298960A JP2003110497A (en) 2001-09-28 2001-09-28 Group communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001298960A JP2003110497A (en) 2001-09-28 2001-09-28 Group communication system

Publications (1)

Publication Number Publication Date
JP2003110497A true JP2003110497A (en) 2003-04-11

Family

ID=19119782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001298960A Pending JP2003110497A (en) 2001-09-28 2001-09-28 Group communication system

Country Status (1)

Country Link
JP (1) JP2003110497A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006339937A (en) * 2005-06-01 2006-12-14 Hitachi Ltd Network system performing application control corresponding to context information
WO2008026430A1 (en) * 2006-08-30 2008-03-06 Pioneer Corporation Communication terminal device, communication method, communication program and recording medium
WO2008047870A1 (en) * 2006-10-18 2008-04-24 Pioneer Corporation Broadcast communication device, communication terminal device, distribution relay device, broadcast communication method, broadcast communication program, and recording medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06311555A (en) * 1993-04-20 1994-11-04 Nec Commun Syst Ltd Group communications system for mobile body communications system
JPH08504548A (en) * 1992-12-17 1996-05-14 ノキア テレコミュニカシオンス オサケ ユキチュア How to keep a group call
JPH0984086A (en) * 1995-09-14 1997-03-28 Sony Corp Information communication equipment
JPH1169417A (en) * 1997-08-19 1999-03-09 Toshiba Corp Mca system radio telephony equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08504548A (en) * 1992-12-17 1996-05-14 ノキア テレコミュニカシオンス オサケ ユキチュア How to keep a group call
JPH06311555A (en) * 1993-04-20 1994-11-04 Nec Commun Syst Ltd Group communications system for mobile body communications system
JPH0984086A (en) * 1995-09-14 1997-03-28 Sony Corp Information communication equipment
JPH1169417A (en) * 1997-08-19 1999-03-09 Toshiba Corp Mca system radio telephony equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006339937A (en) * 2005-06-01 2006-12-14 Hitachi Ltd Network system performing application control corresponding to context information
WO2008026430A1 (en) * 2006-08-30 2008-03-06 Pioneer Corporation Communication terminal device, communication method, communication program and recording medium
WO2008047870A1 (en) * 2006-10-18 2008-04-24 Pioneer Corporation Broadcast communication device, communication terminal device, distribution relay device, broadcast communication method, broadcast communication program, and recording medium

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